Abstract
Purpose
To compare the efficacy of [68Ga]Ga-FAPI-04 PET/CT in primary or recurrent tumors and metastatic lesions of epithelial ovarian cancer (EOC) with that of fluorine-18 fluorodeoxyglucose ([18F]F-FDG) PET/CT.
Methods
Forty-nine patients (median age, 57 years; IQR, 51–66 years) with histologically proven primary or relapsed EOC were enrolled. Participants underwent [18F]F-FDG and [68Ga]Ga-FAPI-04 PET/CT. The detection rate, diagnostic accuracy, semiquantitative parameters, tumor staging, and clinical management of the tracers were compared. The diagnostic performance of [18F]F-FDG and [68Ga]Ga-FAPI-04 PET/CT was evaluated and compared using surgical pathology. Differences between methods regarding the peritoneal cancer index (PCI) using preoperative imaging, surgical PCI, and tumor markers (CA125, HE4) were also assessed regarding peritoneal metastases.
Results
Among the 49 patients, 28 had primary EOC; 21 had relapsed EOC. [68Ga]Ga-FAPI-04 PET/CT outperformed [18F]F-FDG PET/CT in detecting peritoneal metastases (96.8% vs. 83.0%; p < 0.001), retroperitoneal (99.5% vs. 91.4%; p < 0.001), and supradiaphragmatic lymph node metastases (100% vs. 80.4%; p < 0.001). Compared with [18F]F-FDG, [68Ga]Ga-FAPI-04 showed higher SUVmax for peritoneal metastases (17.31 vs. 13.68; p = 0.026) and retroperitoneal (8.72 vs. 6.56; p < 0.001) and supradiaphragmatic lymph node metastases (6.39 vs. 4.20; p < 0.001). Moreover, [68Ga]Ga-FAPI-04 PET/CT showed higher sensitivity compared with [18F]F-FDG PET/CT for detecting metastatic lymph nodes (80.6% vs. 61.3%; p = 0.031) and peritoneal metastases (97.5% vs. 75.9%; p < 0.001), using surgical pathology as the gold standard. Compared with [18F]F-FDG PET/CT, [68Ga]Ga-FAPI-04 PET/CT led to an upgrade in 14.3% and 33.3% of treatment-naive and relapse participants, resulting in management changes in 10.7% and 19.0% of the patients, respectively. The median PCIFAPI scores were significantly higher than PCIFDG (15 vs. 11; p < 0.001) and positively correlated with CA125 and HE4 levels and surgical PCI.
Conclusion
[68Ga]Ga-FAPI-04 PET/CT achieved higher sensitivity than [18F]F-FDG PET/CT in the detection and diagnosis of lymph node and peritoneal metastases, suggesting advantages regarding the preoperative staging of patients with EOC and, thereby, improving treatment decision-making.
Trial registration
NCT05034146. Registered February 23, 2021
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Data availability
Data generated or analyzed during the study are available from the corresponding author by request.
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Acknowledgments
We appreciate Professor Sheng Li (Department of Biological Repositories, Zhongnan Hospital of Wuhan University, Wuhan University) for his help in statistics analysis and Dr. Jane Charbonneau for the wording and grammatical corrections.
Funding
This work was supported by the Improvement Project for Theranostic Ability on Difficulty Miscellaneous Disease (tumor) (No. ZLYNXM202007) and the National Natural Science Foundation of China (No. 82171986).
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All authors contributed to the study conception and design. Yong He and Hongbing Cai designed the research. Jie Chen and Kui Xu conducted the literature search. Chongjiao Li, Yueli Tian, Ling Li, Bing Wen and Can He recruited the patients. Jie Chen, Kui Xu, Chongjiao Li and Ling Li conducted the study and collected and analyzed data. All authors read and approved the final manuscript.
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Chen, J., Xu, K., Li, C. et al. [68Ga]Ga-FAPI-04 PET/CT in the evaluation of epithelial ovarian cancer: comparison with [18F]F-FDG PET/CT. Eur J Nucl Med Mol Imaging 50, 4064–4076 (2023). https://doi.org/10.1007/s00259-023-06369-z
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DOI: https://doi.org/10.1007/s00259-023-06369-z